re: Spraying Sedgehammer/Grass Cutting

Nutsedge has a wide emergence window, especially the purple and yellow. Best time to apply the halo (Sedgehammer) is tween Sept 15 and Oct 15. As with any other perennial the source to sink in the plant is shifting from top growth to survival with reserves being moved to storage parts, like tubers (nutlets). So an application at that time, much like with glyphosate on other perennial weeds, will result in being moved to storage organs for activity and much better long term control and reduced populations over time.